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You can only package one Sim at a time from Body Shop. Once you've created a family in Create-A-Sim, you can leave them in the family bin, but there is no option to upload them to The Exchange nor package them as a .sims2pack file.
I've seen families packaged on empty lots. You might want to try that. However, make sure you're not packaging any recolors or hacks. Inspect the .sims2pack file with
Clean Installer and disable anything you don't want included, and maybe you can get just the family. Honestly, I haven't seen anyone successfully do that yet.